Unsaturated cyclic ethers



Patented June 3, 1947 UNSATURA'I'ED CYCLIC ETHERS Herman A. Bruson, Philadelphia, Pa., assiznor to The Resinous Products Philadelphia, Pa., a c

& Chemical Company,

orporation of Delaware I No Drawing. Application April 1, 1944,

Serial No. 529,196

13 Claims. (01. 260-611) This invention relates to 3,6-endomethy1ene- 1,2,3,6-tetrahydrobenzyl ethers and to a method for their preparation. Said ethers may be represented by the formula:

r H: H I H-CHzOR e wherein R represents an organic radical.

According to this invention, ethers of this formula are obtained by heating dicyclopentadlene with allyl ethers at a temperature from about 150 C. to 200 C. In place of the dicyclopentadiene, there may be used an equivalent amount of monomeric'cyclopentadiene. As is known, dicyclopentadiene reverts to the monomer when heated above 145 C., while the monomer tends to form the polymers when heated or on standing. The dimer has the great advantage that the reaction with an allyl ether may be performed under atmospheric pressure it the allyl ether used boils above about 145 C.

. The heating may be advantageously carried out at atmospheric pressure in avessel equipped with a reflux condenser, but may also be carried out in a closed vessel and under pressure, particularly if the allyl ether boils below 145 C. The reaction which occurs is as follows:

vCH

alkoxy, or other similar groups. R may thus represent any organic radical which helps to rem allyl ether, CH2=CHCH2OR, and may be i'exe' flpliiie by alkyl groups such as methyl, ethyl, prbpyl, isopropyl, butyl, capryl, octyl, decyl, octadecyl, and the like; by alkenyl groups, such "as allyl, methallyl, crotyl, undecenyl, oleyl, or the like; by substituted aliphatic substituents such asethoxyethyl, hydroxyethyl, chloroethyl, dimethylaminoethyl, butoxyethoxyethyl, and the like;

' by arylaliphatic substituents, such as benzyl,

methyibenzyl, butylbenzyl, chlorobenzyl, methoxvbenzyl, phenylbenzyl, phenylethyl, phenoxyethyl, phenoxypropyl, phenoxyethoxyethyl, benzyloxyethyl, and similar radicals; by aryl groups.

such as Dhenyl, chlorophenyl, methylphenyl, butylphenyl, octylphenyl, naphthyl, etc.-, and other cyclic radicals such as cyclohexyl, methylcyclohexyl, cyclopentyl, endomethylene benzyl, dihydronordicyclopentendienyl, terpen'yl, tetrahydrofurfuryl, and other cyclic groups. The ethers in which R is a hydrocarbon radical are of particular importance. Of these,v those in which R contains at least one olefinic linkage, whether in a straight chain or in a cycle, are of particular utility in coating compositions.

The products are of value as intermediates for the preparation or drugs, insecticides, and plastics.

The following examples illustrate this invention:

Example 1 CH C{L\C H1 I! on cream-0% c A mixture of 152 grams of allyl phenyl ether and 84 grams of technical dicyclopentadiene pure) was stirred and heated in an oil bath in a flask attached to a reflux condenser. The

temperature in the flask was held at l70-175 C.

for eight hours. The reaction product was then distilled in vacuo. After unchanged starting material had come over, the. 3,6-endomethylene- 1,2,3,6-tetrahydrobenzyl phenyl ether distilled as an almost colorless oil at -130 C./1 mm. in a yield of grams. The pure compound boils at 134 C./6 mm.

Example 2 cn-pm-o-cmomon C y A mixture/01' 372 grams or p-allyloxyethanol cyclohexylphenyl,

and 250 grams of dicyclopentadiene was heated under a reflux condenser at 145-165 C. for twenty-one hours, and the reaction mixture was distilled in vacuo. I

The desired 3,6-endomethylene-1,2,3,6-tetrahydrobenzyloxyethanol distilled over as. a colorless oil at l05f-110 C./3 mm. in a yield of 312 grams, Upon redistillation, the pure compound boiled at 110-112 C./7 mm. and possessed the following constants: N 1.4920; d4 1.036.

Example 3 A mixture consisting of one mol equivalent of dicyclopentadiene and two mol equivalents of diallyl ether was heated in a closed vessel at 1'70"-- 180 C. for five hours and the product distilled in vacuo. Two main liquid fractions were obtained in addition to unchanged starting material, namely:

I. Boiling range, 65-l10 C./ 5 mm.

H. Boiling range, l10-130 C./5 mm.

Fraction I, upon refractionation, yielded a cut boiling at 80-90 C./14 mm. consisting essentially of 3,6-endomethylene-l,2,3,6-tetrahydrobenzyl allyl ether,

on C{L\CH1 n HCH:O-CHr-CH=CH:

Fraction II, upon refractionation, yielded a cut boiling at 125135 C./6 mm. consisting of the diaddition compound:

on on CH, Cg H H: H!

distilled over at 130 -140" C./l-2-mm. as a thick oil in a yield of 157 grams. Upon redistillation, the pure compound boiled at l30-134 C./1.mm.

Example 5 A mixture of 139 grams of dicyclopentadiene and 190 grams of allyloxydihydronordicyclopentadiene,

was heated.for thirteen hours at 165-l'75 C. under'a reflux condenser, and the product was distilled in vacuo.

The 3,6 endomethylene 1,2,3,6 tetrahydrobenzyl ether of hydroxydihydronordicyclopentadiene,

distilled over at -l60 C./l-2 mm. as a colorless oil in a yield of 208 grams.

- The allyloxydihydronordicyclopentadiene used above is a colorless oil boiling at 117-119 C./l2 mm., obtainedby condensing allyl alcohol with dicyolopentadiene in the presence of an acidic catalyst, such as sulfuric acid, as described in copending application Serial No. 476,640, filed February 20, 1943.

u ii

Example 6 A mixture of 104 grams of dicyclopentadiene' and 183 grams of the allyl ether of p-m,a,'y, -tetra methyl butylphenol was heated under a reflux condenser for eight hours at 1609-175" .0. The

product, upon distillation in vacuo, yielded 154 grams of 3,6-endomethylene-1,2,3,6-tetrahydrobenzyl ether of p-manm-tetramethyl butyl phenol,

C H; H:

as a'pale yellow oil boiling at li:|'l-1'l2 C./l mm.

Example 7 A mixture of '18 grams of 2,4,5-trichlorophenyl allyl ether and 46 grams of dicyclopentadiene was heated at -165 C. for eight hours under a. reflux condenser, and the product was distilled in vacuo. 1

The desired 3,6-endomethylene-l,2,3,6-tetra:

hydrobenzyl ether of 2,4,6-trichlorophenol,

distilled over at l55-160 C./1 mm. as a viscous oil.

Example 8 A mixture 0! 120 grams of dicyclopentadiene and 181 grams of the allyl ether of p-phenylphenol was stirred and heated under a reflux condenser for six hours at 160-165 C. The product was then distilled in vacuo.

The 3,6-endomethylene-1,2,3,6-tetrahydrobenzyl xenyl ether,

am, v

boiled at 200-.205 C./l mmxinay'ield of 100 grams. It is a colorless crystalline-compound, melting at 97 C. after recrystallization from ethanol.

Example 9 A mixture of 96 grams of dicyclopentadiene and 100 grams of benzyl allyl ether was heated for eight hours at 160-168 C. under reflux. Upon distillation of the reaction product in vacuo, there was obtained 82 grams of 3,6-endomethylene-1,2,3,6tetrahydrobenzylbenzyl ether,

H n-orn-o-cHr-can l as a colorless liquid boiling at 114-118 C./0.5 mm. a

Example 10 A mixture of 66 grams of dicyclopentadiene and 128 grams of 2-octyl allyl ether was heated for eight'hours at 160-170 0. Upon distillation in vacuo, the product having the formula:

m CH

was obtained as a faintly yellow oil boiling at ros -114 mm mm.

' Example 11 l The product obtained by heating a mixture of 85 grams of dioyclopentadiene and 133 grams of p-cyclohexylphenyl allyl ether at 165-1'l0 C. for eight hours was distilled in vacuo. At 190-1 95- C./1 mm., a colorless liquid distilled over which rapidly solidified to a crystalline mass. The yield was 85 grams. Upon recrystallization from eth-' anol, the compound having the formula:

formed colorless crystals melting at 68-69 C.

' Example 12 A mixture of 222 grams of p-allyloxypropionitrile and 139 grams of dicyclopentadiene was heated under reflux for six hours at 160-180 C., and the product was distilled in vacuo.

The fraction boiling at 120-138 C./6-7 mm. was a colorless oil having the formula: I

CE I o i orn The yield was l88 grams. Upon redistillation, the pure compound boiled at 104 108 C./1-2. mm.

Example 13 A mixture of 55.6 grams of dicyclopentadiene and 70 grams of allyloxycyclobutane 811110118,

was heated under reflux for eight hours at 160- y y 8 168 c. with constant stirring and the product worked up by distillation in vacuo.

The product having the formula:

distilled at 170-190 C./1 mm. Upon redistillation, the pure compound boiled at 188-194 C./1 mm. It was a viscous pale yellow oil.

I claim: 7 l 1. As new compounds, ethers having the for-- mula:

on C l CHr I H.

H\l HOHr0-R wherein R is a hydrocarbon group.

2. As new compoundsyethers having the forwherein R is an aromatic hydrocarbon radical.

4. Ethers having the formula CH o{l. om

Hg 1 11 21-4: 0-3 H:-

wherein R is a hydrocarbon group containing a benzene ring and six to fourteen carbon atoms.

5. Ethers having the formula:

o l orn i 'l a 11-111: O-R lr wherein R is an aliphatic hydrocarbon radical containing one to eighteen carbon atoms.

6. Ethers having the iormula:

H H-C 0-3.

wherein Bin an aliphatic hydrocarbon radical containing an oleflnic linkage.

. 7 7. Ether-shaving the formula on c l cm H:

wherein R is an alkenlvl group of three to eighteen carbon atoms.

8. The ether having the formula CH (If l C Ha CH-CHr-O-E Ha Hg 11. A method for preparlng'ethers having the formula:

wherein R is a hydrocarbon radical, which comprises heating dicyclopentaldiene with an ally] ether, CH:=CHCHa-OR, at a temperature between about and 200 C.

12. A method for preparing an ether having the formula:

Gr m,

which comprises heating dicyclopentadiene with phenyi alLvl ether at a temperature between about 150 and 200 C. v

13. A method for preparing an ether having the formula:

wherein R is a hydrocarbon radical containing an oleflnic linkage, which comprises heating dicyclopentadiene with an allyl ether,

wherein R has the same significance, at a temperature between about 150 and 200 C.

HERMAN A. BRUSON.

REFERENCES crrnn The following references are of record in the file of this patent:

Alder 8: Wendemuth, Berichte 713, 1939-57 (1938).

(Copy of Beriohte in Pat. Ofl. Lib.) 

